<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>绘制波点背景</title>
    <style>
        .dot-pattern {
            width: 800px;
            height: 200px;
            border: 1px solid red;
            background-image: radial-gradient(circle 10px at center center,#666 2px, transparent 3px);
            background-size: 20px 20px;
        }
    </style>
</head>
<body>
    <div class="dot-pattern"></div>
</body>
</html>
